Privacy filter keeps confidential information private. Only persons directly in front of the monitor can see the image on screen while others on either side of it see a darkened screen. It is great for high-traffic areas and open office environments. Filter is designed to fit standard desktop LCD monitors with a diagonally measured 21-5/16" viewing screen and a 4:3 aspect ratio. Actual filter dimensions are 17" wide x 12-3/4" high (433mm x 325mm). Filter includes your choice of two easy attachment methods. Reversible, matte side reduces glare and reflections. Lightweight, thin, frameless design protects display from dirt, debris and scratches. Clean easily with a soft cloth and water.